package com.mmall.service.Impl;

import com.mmall.common.Const;
import com.mmall.common.ResponseCode;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.MD5Util;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.UUID;

@Service("iUserService")
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserMapper userMapper;

    /**
     * 用户登录功能
     * @param username
     * @param password
     * @return
     */
    @Override
    public ServerResponse<User> login(String username, String password) {
        int resultCount = userMapper.checkUsername(username);
        if(resultCount == 0){
            return ServerResponse.createByErrorMessage("用户名不存在");
        }
        //todo 密码登录MD5
        String md5Password = MD5Util.MD5EncodeUtf8(password);
        User user = userMapper.selectLogin(username, md5Password);
        if (user == null){
            return ServerResponse.createByErrorMessage("密码错误");
        }
        //把密码置位空
        user.setPassword(org.apache.commons.lang3.StringUtils.EMPTY);
        return ServerResponse.createBySuccess("登陆成功", user);
    }

    /**
     * 用户注册功能
     * @param user
     * @return
     */
    public ServerResponse<String> register(User user){
        ServerResponse validResponse = this.checkValid(user.getUsername(), Const.USERNAME);
        if (!validResponse.isSuccess()){
            return validResponse;
        }
        validResponse = this.checkValid(user.getEmail(), Const.EMAIL);
        if (!validResponse.isSuccess()){
            return validResponse;
        }
        user.setRole(Const.Role.ROLE_CUSTOMER);
        //MD5加密
        user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));
        int  resultCount = userMapper.insert(user);
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("注册失败");
        }
        return ServerResponse.createBySuccessMessage("注册成功");
    }

    /**
     * 判断是用户，邮箱，是否存在
     * @param str
     * @param type
     * @return
     */
    public ServerResponse<String> checkValid(String str,String type){
       if (org.apache.commons.lang3.StringUtils.isNotBlank(type)){
           if(Const.USERNAME.equals(type)){
               //开始校验
               int resultCount = userMapper.checkUsername(str);
               if (resultCount > 0){
                   return ServerResponse.createByErrorMessage("用户名已存在");
               }
           }
           if(Const.EMAIL.equals(type)){
               int resultCount = userMapper.checkEmail(str);
               if (resultCount > 0){
                   return ServerResponse.createByErrorMessage("email已存在");
               }
           }
       }else {
           return ServerResponse.createByErrorMessage("参数错误");
       }
        return ServerResponse.createBySuccessMessage("检验成功");
    }

    /**
     * 查询密码提示问题
     * @param username
     * @return
     */
    public ServerResponse selectQuestion(String username){
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if(validResponse.isSuccess()){
            //用户不存在
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        String question = userMapper.selectQuestionByUsername(username);
        if (org.apache.commons.lang3.StringUtils.isNotBlank(question)){
            return ServerResponse.createBySuccess(question);
        }
        return ServerResponse.createByErrorMessage("找回密码的问题是空的");
    }

   /** public static void main(String[] args) {
        System.out.println(UUID.randomUUID().toString());
    }**/
    /**
     * 校验密码提示问题，并进行用户判断
     * @param username
     * @param question
     * @param answer
     * @return
     */
    public ServerResponse<String> checkAnswer(String username,String question,String answer){
        int resultCount = userMapper.checkAnswer(username, question, answer);
        if(resultCount > 0){
            //说明问题及问题答案是这个用户的,并且是正确的
            String forgetToken = UUID.randomUUID().toString();
            TokenCache.setKey(TokenCache.TOKEN_PREFIX+username,forgetToken);
            return ServerResponse.createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题的答案错误");
    }

    /**、
     * 根据用户名更新密码
     * @param username
     * @param passwordNew
     * @param forgetToken
     * @return
     */
    public ServerResponse<String> forgetResetPassword(String username,String passwordNew,String forgetToken){
        if(org.apache.commons.lang3.StringUtils.isBlank(forgetToken)){
            return ServerResponse.createByErrorMessage("参数错误，token需要传递");
        }
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if(validResponse.isSuccess()){
            //用户不存在
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX + username);
        if(org.apache.commons.lang3.StringUtils.isBlank(token)){
            return ServerResponse.createByErrorMessage("token无效或者过期");
        }
        //MD5加密
        if (org.apache.commons.lang3.StringUtils.equals(forgetToken,token)){
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            //根据用户名更新密码
            int rowCount = userMapper.updatePasswordByUsername(username, md5Password);
            if(rowCount > 0){
                return ServerResponse.createBySuccessMessage("修改密码成功");
            }
        } else{
            return ServerResponse.createByErrorMessage("token错误，请重新获取密码的token");
        }
        return ServerResponse.createByErrorMessage("修改密码失败");
    }

    /**
     * 用户登录状态下修改密码
     * @param passwordOld
     * @param passwordNew
     * @param user
     * @return
     */
    public ServerResponse<String> resetPassword(String passwordOld,String passwordNew,User user){
     //防止横向越权，要校验一下这个用户的旧密码，一定要指定是这个用户，因为会查询一个count(1),如果不指定id，那么true就是count>0
        int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld),user.getId());
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("旧密码错误");
        }
        user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
        int updateCount = userMapper.updateByPrimaryKeySelective(user);
        if (updateCount > 0){
            return ServerResponse.createBySuccessMessage("密码更新成功");
        }
        return ServerResponse.createByErrorMessage("密码更新失败");
    }

    /**
     * 更新用户个人信息
     * @param user
     * @return
     */
    public ServerResponse<User> updateInfomation(User user){
      //username不能被更新
      //email也要进行一个校验,校验新的email是不是已经存在,并且存在的email如果相同的话,不能是我们当前这个用户的
        int resultCount = userMapper.checkEmailByUserId(user.getEmail(), user.getId());
        if (resultCount > 0){
            return ServerResponse.createByErrorMessage("email已存在,请更换email再尝试更新");
        }
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());
        int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);
        if (updateCount > 0){
            return ServerResponse.createBySuccess("更新个人信息成功",updateUser);
        }
        return ServerResponse.createByErrorMessage("更新个人信息失败");
    }

    /**
     * 获取用户详细信息
     * @param userId
     * @return
     */
    public ServerResponse<User> getInformation(Integer userId){
        User user = userMapper.selectByPrimaryKey(userId);
        if (user == null){
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        //将用户密码设置为空
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }

    /**
     * 校验是否为管理员
     * @param user
     * @return
     */
    public ServerResponse checkAdminRole(User user){
      if (user != null && user.getRole().intValue() == Const.Role.ROLE_ADMIN){
          return ServerResponse.createBySuccess();
      }
        return ServerResponse.createByError();
    }
}
